diff options
Diffstat (limited to 'addons/ot/src/event.c')
| -rw-r--r-- | addons/ot/src/event.c | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/addons/ot/src/event.c b/addons/ot/src/event.c new file mode 100644 index 0000000..dc29d52 --- /dev/null +++ b/addons/ot/src/event.c @@ -0,0 +1,338 @@ +/*** + * Copyright 2020 HAProxy Technologies + * + * This file is part of the HAProxy OpenTracing filter. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "include.h" + + +#define FLT_OT_EVENT_DEF(a,b,c,d,e,f) { AN_##b##_##a, SMP_OPT_DIR_##b, SMP_VAL_FE_##c, SMP_VAL_BE_##d, e, f }, +const struct flt_ot_event_data flt_ot_event_data[FLT_OT_EVENT_MAX] = { FLT_OT_EVENT_DEFINES }; +#undef FLT_OT_EVENT_DEF + + +/*** + * NAME + * flt_ot_scope_run_span - + * + * ARGUMENTS + * s - + * f - + * chn - + * dir - + * span - + * data - + * conf_span - + * ts - + * err - + * + * DESCRIPTION + * - + * + * RETURN VALUE + * Returns a negative value if an error occurs, 0 if it needs to wait, + * any other value otherwise. + */ +static int flt_ot_scope_run_span(struct stream *s, struct filter *f, struct channel *chn, uint dir, struct flt_ot_scope_span *span, struct flt_ot_scope_data *data, const struct flt_ot_conf_span *conf_span, const struct timespec *ts, char **err) +{ + struct flt_ot_conf *conf = FLT_OT_CONF(f); + int retval = FLT_OT_RET_OK; + + FLT_OT_FUNC("%p, %p, %p, %u, %p, %p, %p, %p, %p:%p", s, f, chn, dir, span, data, conf_span, ts, FLT_OT_DPTR_ARGS(err)); + + if (span == NULL) + FLT_OT_RETURN_INT(retval); + + if (span->span == NULL) { + span->span = ot_span_init(conf->tracer->tracer, span->id, ts, NULL, span->ref_type, FLT_OT_DEREF(span->ref_ctx, idx, -1), span->ref_span, data->tags, data->num_tags, err); + if (span->span == NULL) + retval = FLT_OT_RET_ERROR; + } + else if (data->num_tags > 0) + if (ot_span_tag(span->span, data->tags, data->num_tags) == -1) + retval = FLT_OT_RET_ERROR; + + if ((span->span != NULL) && (data->baggage != NULL)) + if (ot_span_set_baggage(span->span, data->baggage) == -1) + retval = FLT_OT_RET_ERROR; + + if ((span->span != NULL) && (data->num_log_fields > 0)) + if (ot_span_log(span->span, data->log_fields, data->num_log_fields) == -1) + retval = FLT_OT_RET_ERROR; + + if ((span->span != NULL) && (conf_span->ctx_id != NULL)) { + struct otc_http_headers_writer writer; + struct otc_text_map *text_map = NULL; + struct otc_span_context *span_ctx; + + span_ctx = ot_inject_http_headers(conf->tracer->tracer, span->span, &writer, err); + if (span_ctx != NULL) { + int i = 0; + + if (conf_span->ctx_flags & (FLT_OT_CTX_USE_VARS | FLT_OT_CTX_USE_HEADERS)) { + for (text_map = &(writer.text_map); i < text_map->count; i++) { +#ifdef USE_OT_VARS + if (!(conf_span->ctx_flags & FLT_OT_CTX_USE_VARS)) + /* Do nothing. */; + else if (flt_ot_var_register(FLT_OT_VARS_SCOPE, conf_span->ctx_id, text_map->key[i], err) == -1) + retval = FLT_OT_RET_ERROR; + else if (flt_ot_var_set(s, FLT_OT_VARS_SCOPE, conf_span->ctx_id, text_map->key[i], text_map->value[i], dir, err) == -1) + retval = FLT_OT_RET_ERROR; +#endif + + if (!(conf_span->ctx_flags & FLT_OT_CTX_USE_HEADERS)) + /* Do nothing. */; + else if (flt_ot_http_header_set(chn, conf_span->ctx_id, text_map->key[i], text_map->value[i], err) == -1) + retval = FLT_OT_RET_ERROR; + } + } + + span_ctx->destroy(&span_ctx); + otc_text_map_destroy(&text_map, OTC_TEXT_MAP_FREE_KEY | OTC_TEXT_MAP_FREE_VALUE); + } + } + + FLT_OT_RETURN_INT(retval); +} + + +/*** + * NAME + * flt_ot_scope_run - + * + * ARGUMENTS + * s - + * f - + * chn - + * conf_scope - + * ts - + * dir - + * err - + * + * DESCRIPTION + * - + * + * RETURN VALUE + * Returns a negative value if an error occurs, 0 if it needs to wait, + * any other value otherwise. + */ +int flt_ot_scope_run(struct stream *s, struct filter *f, struct channel *chn, struct flt_ot_conf_scope *conf_scope, const struct timespec *ts, uint dir, char **err) +{ + struct flt_ot_conf *conf = FLT_OT_CONF(f); + struct flt_ot_conf_context *conf_ctx; + struct flt_ot_conf_span *conf_span; + struct flt_ot_conf_str *finish; + struct timespec ts_now; + int retval = FLT_OT_RET_OK; + + FLT_OT_FUNC("%p, %p, %p, %p, %p, %u, %p:%p", s, f, chn, conf_scope, ts, dir, FLT_OT_DPTR_ARGS(err)); + + FLT_OT_DBG(3, "channel: %s, mode: %s (%s)", flt_ot_chn_label(chn), flt_ot_pr_mode(s), flt_ot_stream_pos(s)); + FLT_OT_DBG(3, "run scope '%s' %d", conf_scope->id, conf_scope->event); + FLT_OT_DBG_CONF_SCOPE("run scope ", conf_scope); + + if (ts == NULL) { + (void)clock_gettime(CLOCK_MONOTONIC, &ts_now); + + ts = &ts_now; + } + + if (conf_scope->cond != NULL) { + enum acl_test_res res; + int rc; + + res = acl_exec_cond(conf_scope->cond, s->be, s->sess, s, dir | SMP_OPT_FINAL); + rc = acl_pass(res); + if (conf_scope->cond->pol == ACL_COND_UNLESS) + rc = !rc; + + FLT_OT_DBG(3, "the ACL rule %s", rc ? "matches" : "does not match"); + + /* + * If the rule does not match, the current scope is skipped. + * + * If it is a root span, further processing of the session is + * disabled. As soon as the first span is encountered which + * is marked as root, further search is interrupted. + */ + if (!rc) { + list_for_each_entry(conf_span, &(conf_scope->spans), list) + if (conf_span->flag_root) { + FLT_OT_DBG(0, "session disabled"); + + FLT_OT_RT_CTX(f->ctx)->flag_disabled = 1; + + _HA_ATOMIC_ADD(conf->cnt.disabled + 0, 1); + + break; + } + + FLT_OT_RETURN_INT(retval); + } + } + + list_for_each_entry(conf_ctx, &(conf_scope->contexts), list) { + struct otc_text_map *text_map = NULL; + + FLT_OT_DBG(3, "run context '%s' -> '%s'", conf_scope->id, conf_ctx->id); + FLT_OT_DBG_CONF_CONTEXT("run context ", conf_ctx); + + /* + * The OpenTracing context is read from the HTTP header + * or from HAProxy variables. + */ + if (conf_ctx->flags & FLT_OT_CTX_USE_HEADERS) + text_map = flt_ot_http_headers_get(chn, conf_ctx->id, conf_ctx->id_len, err); +#ifdef USE_OT_VARS + else + text_map = flt_ot_vars_get(s, FLT_OT_VARS_SCOPE, conf_ctx->id, dir, err); +#endif + + if (text_map != NULL) { + if (flt_ot_scope_context_init(f->ctx, conf->tracer->tracer, conf_ctx->id, conf_ctx->id_len, text_map, dir, err) == NULL) + retval = FLT_OT_RET_ERROR; + + otc_text_map_destroy(&text_map, OTC_TEXT_MAP_FREE_KEY | OTC_TEXT_MAP_FREE_VALUE); + } else { + retval = FLT_OT_RET_ERROR; + } + } + + list_for_each_entry(conf_span, &(conf_scope->spans), list) { + struct flt_ot_scope_data data; + struct flt_ot_scope_span *span; + struct flt_ot_conf_sample *sample; + + FLT_OT_DBG(3, "run span '%s' -> '%s'", conf_scope->id, conf_span->id); + FLT_OT_DBG_CONF_SPAN("run span ", conf_span); + + (void)memset(&data, 0, sizeof(data)); + + span = flt_ot_scope_span_init(f->ctx, conf_span->id, conf_span->id_len, conf_span->ref_type, conf_span->ref_id, conf_span->ref_id_len, dir, err); + if (span == NULL) + retval = FLT_OT_RET_ERROR; + + list_for_each_entry(sample, &(conf_span->tags), list) { + FLT_OT_DBG(3, "adding tag '%s' -> '%s'", sample->key, sample->value); + + if (flt_ot_sample_add(s, dir, sample, &data, FLT_OT_EVENT_SAMPLE_TAG, err) == FLT_OT_RET_ERROR) + retval = FLT_OT_RET_ERROR; + } + + list_for_each_entry(sample, &(conf_span->logs), list) { + FLT_OT_DBG(3, "adding log '%s' -> '%s'", sample->key, sample->value); + + if (flt_ot_sample_add(s, dir, sample, &data, FLT_OT_EVENT_SAMPLE_LOG, err) == FLT_OT_RET_ERROR) + retval = FLT_OT_RET_ERROR; + } + + list_for_each_entry(sample, &(conf_span->baggages), list) { + FLT_OT_DBG(3, "adding baggage '%s' -> '%s'", sample->key, sample->value); + + if (flt_ot_sample_add(s, dir, sample, &data, FLT_OT_EVENT_SAMPLE_BAGGAGE, err) == FLT_OT_RET_ERROR) + retval = FLT_OT_RET_ERROR; + } + + if (retval != FLT_OT_RET_ERROR) + if (flt_ot_scope_run_span(s, f, chn, dir, span, &data, conf_span, ts, err) == FLT_OT_RET_ERROR) + retval = FLT_OT_RET_ERROR; + + flt_ot_scope_data_free(&data); + } + + list_for_each_entry(finish, &(conf_scope->finish), list) + if (flt_ot_scope_finish_mark(f->ctx, finish->str, finish->str_len) == -1) + retval = FLT_OT_RET_ERROR; + + flt_ot_scope_finish_marked(f->ctx, ts); + flt_ot_scope_free_unused(f->ctx, chn); + + FLT_OT_RETURN_INT(retval); +} + + +/*** + * NAME + * flt_ot_event_run - + * + * ARGUMENTS + * s - + * f - + * chn - + * event - + * err - + * + * DESCRIPTION + * - + * + * RETURN VALUE + * Returns a negative value if an error occurs, 0 if it needs to wait, + * any other value otherwise. + */ +int flt_ot_event_run(struct stream *s, struct filter *f, struct channel *chn, int event, char **err) +{ + struct flt_ot_conf *conf = FLT_OT_CONF(f); + struct flt_ot_conf_scope *conf_scope; + struct timespec ts; + int retval = FLT_OT_RET_OK; + + FLT_OT_FUNC("%p, %p, %p, %d, %p:%p", s, f, chn, event, FLT_OT_DPTR_ARGS(err)); + + FLT_OT_DBG(3, "channel: %s, mode: %s (%s)", flt_ot_chn_label(chn), flt_ot_pr_mode(s), flt_ot_stream_pos(s)); + FLT_OT_DBG(3, "run event '%s' %d", flt_ot_event_data[event].name, event); + +#ifdef DEBUG_OT + _HA_ATOMIC_ADD(conf->cnt.event[event].htx + (htx_is_empty(htxbuf(&(chn->buf))) ? 1 : 0), 1); +#endif + + FLT_OT_RT_CTX(f->ctx)->analyzers |= flt_ot_event_data[event].an_bit; + + /* All spans should be created/completed at the same time. */ + (void)clock_gettime(CLOCK_MONOTONIC, &ts); + + /* + * It is possible that there are defined multiple scopes that use the + * same event. Therefore, there must not be a 'break' here, ie an + * exit from the 'for' loop. + */ + list_for_each_entry(conf_scope, &(conf->scopes), list) { + if (conf_scope->event != event) + /* Do nothing. */; + else if (!conf_scope->flag_used) + FLT_OT_DBG(3, "scope '%s' %d not used", conf_scope->id, conf_scope->event); + else if (flt_ot_scope_run(s, f, chn, conf_scope, &ts, flt_ot_event_data[event].smp_opt_dir, err) == FLT_OT_RET_ERROR) + retval = FLT_OT_RET_ERROR; + } + +#ifdef USE_OT_VARS + flt_ot_vars_dump(s); +#endif + flt_ot_http_headers_dump(chn); + + FLT_OT_DBG(3, "event = %d, chn = %p, s->req = %p, s->res = %p", event, chn, &(s->req), &(s->res)); + + FLT_OT_RETURN_INT(retval); +} + +/* + * Local variables: + * c-indent-level: 8 + * c-basic-offset: 8 + * End: + * + * vi: noexpandtab shiftwidth=8 tabstop=8 + */ |